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Chinese Agricultural Science Bulletin ›› 2018, Vol. 34 ›› Issue (3): 152-157.doi: 10.11924/j.issn.1000-6850.casb16120132

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Extractants and Extraction Conditions of Soil Available Selenium in Selenium-enriched Soil

  

  • Received:2016-12-28 Revised:2018-01-10 Accepted:2017-01-20 Online:2018-02-01 Published:2018-02-01

Abstract: Selenium-enriched soil in eastern Qinghai was used as test material to select optimum extractants (from NaHCO3、KH2PO4、K2SO4、EDTA、AB-DTPA and DTPA) and the corresponding extraction conditions for soil available selenium, and the optimum extractant and extraction condition were studied by wheat test. The results showed that the amounts of available selenium which extracted by six extractants all decreased with the ratio of soil to solution, and increased with the shaking time. The optimum ratio of soil to solution and shaking time of EDTA and DTPA were 1/20 and 30 min; the optimum ratio of soil to solution was 1/15 for K2SO4, ABDTPA, NaHCO3 and KH2PO4; and the optimum shaking time was 60 min for K2SO4 and AB-DTPA; and that for NaHCO3 and KH2PO4 was 90 min. There was a significantly positive correlation between the contents of available selenium in soil and the contents of selenium enrichment in wheat grain under the optimum extraction condition, but selenium amount that extracted by DTPA was the minimum, then was that extracted by K2SO4, which were only 16% to 47% and 36% to 85% of those of KH2PO4, NaHCO3, AB-DTPA and EDTA, so DTPA and K2SO4 were not suitable for available selenium extraction from selenium-enriched limy soil. The contents of selenium extracted by KH2PO4, NaHCO3, AB- DTPA and EDTA were not only significantly correlated with selenium contents in wheat grain, but also had high extraction rate, and the extraction process was simple and reproducible, so the four kinds of extractants could be used in selenium-enriched limy soil.

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